RE: Secondary butterflies

[Sean B <polecat2@xxxxxxxx>]

John,

Thanks for the detailed explanation.  Do you know how the early-mid 
sixties AFB's worked, since they had no secondary air valve of any kind? 
 I can't seem to find an answer.

Sean


althausjbl@xxxxxxx wrote:
> 
> 
> Rich, 
> I know everyone has had their say on this, but the AVS is to prevent the 
> "bog" which isn't really a bog. but a lean stumble. These carbs do not 
> have a secondary accelerator pump so as the secondaries open they must 
> start drawing fuel to keep the mixture correct. Holley solved this 
> problem by going to a "double pumper" which has a accelerator pump on 
> the secondaries as well as on the primaries. The AVS allow the air flow 
> to slowly match to the fuel available rather than opening suddenly and 
> going lean. I'm sure that the weights are on the conservative side as 
> evidenced by the Edelbrock tech telling you to drill them to open the 
> sooner, but with out them you will get the lean stumble when suddenly 
> going WOT.? If your old enough to remember the old "screw in the 
> linkage" in the vacuum secondaries of Holleys you saw the same stumble 
> you will experience.? Long and short of this, leave the AVS in and work 
> on opening timing if your looking for the most from those carbs.
> 
> John Althaus
> 64 Savoy Hemi 4 spd


----
Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.